Ninigi DSK-04 is a multipurpose Digital Signal Processing (DSP) toolkit developed by Japan-based Ninigi Corporation. It is a comprehensive suite of software tools and libraries for signal processing and machine learning applications. The toolkit provides a library of functions, implementations of algorithms, and APIs (Application Programming Interfaces). It contains more than 200 signal processing functions, including application-specific data analysis, signal processing, signal generation, signal modulation, as well as communications and system-level modelling. It is compatible with a number of distributed computing platforms, such as the Microsoft Windows, Windows CE, ARM Cortex-M, and Arduino-based platforms. Additionally, it supports several high-level programming languages, including C, C++, and MATLAB. With its high-performance, efficient operation, and compatibility with Microsoft Windows, the Ninigi DSK-04 offers an optimized solution for a wide range of signal processing applications.